1 /*

     2  * Copyright 2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 6379235

    27  * @run main/othervm -server -Xmx32m -Xms32m -Xss256m StartOOMTest

    28  * @summary ThreadGroup accounting mistake possible with failure of Thread.start()

    29  */

    30 

    31 import java.util.*;

    32 

    33 public class StartOOMTest

    34 {

    35     public static void main(String[] args) throws Throwable {

    36         Runnable r = new SleepRunnable();

    37         ThreadGroup tg = new ThreadGroup("buggy");

    38         List<Thread> threads = new ArrayList<Thread>();

    39         Thread failedThread;

    40         int i = 0;

    41         for (i = 0; ; i++) {

    42             Thread t = new Thread(tg, r);

    43             try {

    44                 t.start();

    45                 threads.add(t);

    46             } catch (Throwable x) {

    47                 failedThread = t;

    48                 System.out.println(x);

    49                 System.out.println(i);

    50                 break;

    51             }

    52         }

    53 

    54         int j = 0;

    55         for (Thread t : threads)

    56             t.interrupt();

    57 

    58         while (tg.activeCount() > i/2)

    59             Thread.yield();

    60         failedThread.start();

    61         failedThread.interrupt();

    62 

    63         for (Thread t : threads)

    64             t.join();

    65         failedThread.join();

    66 

    67         try {

    68             Thread.sleep(1000);

    69         } catch (Throwable ignore) {

    70         }

    71 

    72         int activeCount = tg.activeCount();

    73         System.out.println("activeCount = " + activeCount);

    74 

    75         if (activeCount > 0) {

    76             throw new RuntimeException("Failed: there  should be no active Threads in the group");

    77         }

    78     }

    79 

    80     static class SleepRunnable implements Runnable

    81     {

    82         public void run() {

    83             try {

    84                 Thread.sleep(60*1000);

    85             } catch (Throwable t) {

    86             }

    87         }

    88     }

    89 }